Furnace-casing bonnet



Feb. 5, 1929. 11,700,838

F. E. FORD j FURNACE CASING BONNET Filed Aug. 5. 1928 W P{/llllllIlllHIIllIl l lllfilllllllll:LIE :16

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FRANK n. FORD, or onroseo, rumors, sssienon TO THE nxcnnsron ST EL FUR-naen COMPANY, or oniceeo, ILL-triers, a eouronerron on rumors.

summon-ensure BONNET. j

Application filed August 3, 1928. Seria1 No.- 297,176.

My present invention relates to improvements in knock-down furnacecasing bonnets with integral top and completely fabricated side walls. I

I am aware that furnace casings, as well as bonnets, have heretoforebeen made in sections to be assembled at the place the furnace iserected, but in designing a structure of this kind it is desirable tocomplete the structure so far as possible in the factory, both in orderto reduce the amount of assembly necessary on the job and because thefactory work is capable of much better systemiza'tion and checking,which conserve economy and secure a more sturdy and dependablestructure.

As will be hereafter seen, my improved casing bonnet, when it leaves thefactory, comprises two parts only-a top and the side wall, which may bereadily assembled with each other and the usual top casing ring and whenso assembled will h ave the same sturdiness and dependability as acasing bonnet which was made and completely assembled in final form inthe factory.

The one piece or integral top and the completely fabricated side wall ofmy casing bonnet are not only stronger but are also more resistent torust than similar elements joined or articulated from any larger number.of parts, and are also more nearly air tight.

It will also be hereafter seen and noted that the assembly hereinaftershown between the top and side walls ofthe bonnet material- 1yreinforces and strengthens both of these elements as well as thecompletely assembled structure.

I have attained the foregoing objects and accomplished theaforementioned results by means of the structure illustrated in theaccompanying drawing, in which Fig. l is an clm'ation partly in sectionof one form of a furnace casing bonnet embodying my invention.

Fig. 2 is an elevation partly in section. of a modified form of afurnace casing bonnet embodying my invention.

Fig, 3 is a fragmental sectional detail showing the manner of assemblyof side and top wall in the form shown in Fig. 1.

Fig. 4 is a section on line l 4t of Fig. 2 showing the juncture betweenthe ends of the side Wall. 7 I

Similar reference characters refer to similar parts throughouttheseveral views. In both forms of structure herein illustrated it ispreferred to make the top ofthe bonnet a single integral piece of metalasbeing better adapted to withstand the. atmospherlc moisture" and thechanges of temperature to which-the structure is subject in service. Theside wall of both forms also should be made of as few pieces aspossible, al-

though the vertical or nearly vertical disposition of the side of thebonnet serves to protect them to a considerable extent from bothreceiving and. retaining moisture'or other foreign matter depositedthereon by condensat1on or gravltatlon fromthe; surrounding atmosphere.

under a flange 9 extending laterally from a circumferential annulus orring 10, in the center of which is a head 11. The flange 9 is furthersecured within the turned edges of the top 8 by crimping these parts, asat 12, after the flange 9 has been inserted in the hook or loop of theedge of the top.' This assembly is clearlyshown in Fig. 3. Y

In the form of structure shown in Fig. 1 the sidewall 13 inclinesinwardly from the bottom to the top and around the top of the side wallis provided a bead .1 to engage with the head .70 In the form ofstructure shown in Fig. 1 the one piece top wall'8 is givenaninvertedpyramidal form.- The edges or periphery of the top 8, whichis circular,are bent over and 11 of the ring 10. The bottom of the side;

wall of the structure shown in Fig; 1 is also 16 of the ordinary form offurnacecasing.

ring, which, as iswell known, is provided with an: exterior shoulder 1?running around the middle thereof against which'the ends of the upperand lower casing segments abut. As shown in Fig. 4 one end of the sidewall is provided with a transverse shoulder 18 between the head 14 andthe crimping at 15. The end is carried beyond the shoulder 18, as at 19,and then bent back upon itself, as at 20, and then backwardly againparallel .to the part 19, as at 21, to form a slot or pocket 22' for thereception of the other end of the side wall.

Secured to the opposite ends of side wall 13 are pairs-of right angle orL-sha ped brackion ets 23, one leg of these brackets being riveted orotherwise secured to the wall 13 opposite each other. The outstandingarm of the L- shaped brackets 23 are bored to receive the boltor machinescrew 24, on the end of which screws the nut 2-5.

In assembling my bonnet'the side wall is unrolled and is disposed aboutthe ring 10 with its upper end abutting the flange 9 and the bolt Zlisplaced in theupper pair of brackets, so as to hold these pieces looselyin assembly, The bottom of the side wall is then, fitted to the casingring 16, and a bolt 24: in the bottom pair of brackets 23. is insertedand turnedup, By adjusting the two bolts a great degree (ifrigidity'between the elements can be secured and the crimping of the 7lower end of the side wall where it assembles with the casing ringpermits the adaption of these members to. one another with great mean IThe structure shown in Fig. 2 differs only from, that shown in Fig, l inhaving a flat top 8 instead of an invertedpyramidal top, and in havingvertical side wall 13 instead f slightly in li ed side wall. By stackingthe tops and rolling the sides one within another space can, beconserved both in shipment and storage and in assembly the ring 10 withits flange 9 materially reinforces and strengthens both the top and sidewall and the completed structure when these parts are assembled.

Having described my invention what I the lateral flange of a laterallyflanged and centrally beaded annulus or ring, and a side Wall onelongitudinal edge whereof is beaded to engage the head in said annulusor ring, and the other longitudinal edge whereof is crimped, atransverse pocket on one end of said wall adapted to receive the othertransverse find thereof, and means for drawing and securing theentermgedge into the pocket of the opposing edge. I 3. A hon-net for afurnace casing comprising aone piece top of circular form, the edgeswhereof are turned over to engage the lateral flange of a laterallyflanged and centrally beaded annulus or ring. and a side wall, onelengitudu al edge whereof 1s beaded to engage the head in said annulusor ring, and the other longitudinal ed e whereof is crimped, and meal ofsaid side wall together.

for securing the transverse ends 4. A bonnet for a furnace casingcomprising a one piece top of circular form, the edges \cvhereof areturned over to engage the lateral flange of a laterally flanged annulusor ring,

ands side wall, one longitudinal edge whereof engages said annulus orring, and the other longitudinal edge whereof is. crimped, and means,for securing the transverse ends of said side wall together.

5. A bonnet for a furnace casing comprising a one piece top of circularform, the edges wl'lereof are turned over to engage the lateral flangeof a laterally flanged and centrally beaded annulus or ring, and a sidewall, one longitudinal edge whereof is headed toengage the bead in saidannulus or ring, and means for securing the transverse ends of said sidewall together. 7

F RANK FORD.

